Touch N foam triple expansion insulating foam is an expansion foam used to fill holes and voids. Also seals and insulates, bonds to most surfaces, and is tack free in 30 minutes. Can be sanded or painted with in hour. Our maximum expanding formula in the familiar green can is the original Touch 'n Foam sealant formulated to fill gaps and voids all around the home. Max Fill provides three times the expansion to fill gaps greater than 1 inch wide.